Question

For which of the following reaction, the degree of dissociation (α) and equilibrium constant (Kp) are related as Kp=4α2P(1-α2)?
(1) N2O4(g) ⇌ 2NO2(g)
(2) H2(g) + I2(g) ⇌ 2HI(g)
(3) N2(g) + 3H2(g) ⇌ 2NH3(g)
(4) PCl3(g) + Cl2(g) ⇌ PCl5(g)

Answer 1

                           N2O4(g) ⇌ 2NO2(g)

Initially:                    1                  0

Finally:                   1-α                2α

Let х = mole fraction = number of moles/ total moles ; P= total pressure

Now, total moles = 1-α+2α = 1+α

We know, Kp= (PNO2)²/PN2O4 =  (хNO2 * P)²/(хN2O4 * P) = (2αP/(1+α))²/((1-α)P/(1+α)) = 4α²P/((1+α)(1-α)) = 4α²P/(1-α²)

Hence, option (1) N2O4(g) ⇌ 2NO2(g) is correct.

If you are satisfied with my answer please mark it as the brainliest. Thank you.

Answer 2

here's the answer and hope this helps you.